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Updated: Dec 22, 2025

Human Egg Maturity Assessment and Its Clinical Application
Published on: August 19, 2019
[Effects of different ages and body mass index on embryo development time kinetic parameters and embryo development
H X Jin1, S S Wang1, W Y Song1
1Reproductive Medicine Center of the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
Abstract:
Objective: To investigate the effects of age and body mass index (BMI) on embryo development time kinetic parameters, embryo development potential and clinical pregnancy outcomes. Methods: A retrospective study was conducted to analyze the data of 6 294 embryos from 832 patients who underwent in vitro fertilization and embryo transfer (IVF-ET) in the Reproductive Medicine Center of the First Affiliated Hospital of Zhengzhou University from September 2016 to November 2018. According to the age, they were divided into two groups:<35-year-old group (655 cases, 5 076 embryos), ≥35-year-old group (177 cases, 1 218 embryos). According to the BMI, they were divided into three groups: low body mass group (BMI<18.5 kg/m(2), 47 cases, 355 embryos), normal body recombination (18.5-23.9 kg/m(2), 517 cases, 3 813 embryos), hyperrecombination (BMI>23.9 kg/m(2), 268 cases, 2 126 embryos). Embryo development time kinetic parameters, embryo development potential and clinical pregnancy outcomes in each group were compared. Results: Embryo development to 3 cells, 4 cells were faster in <35-year-old group than in ≥35-year-old group. The blastocyst formation rate, high-quality blastocyst formation rate, pregnancy rate, implantation rate, delivery rate, live birth rate, and abortion rate were all statistically significant (all P<0.05). There were no significant differences in normal fertilization rate, cleavage rate, embryo utilization rate, high quality embryo rate, pregnancy rate, implantation rate, abortion rate, delivery rate, live birth rate between the three BMI groups (all P>0.05). Conclusions: The age has an effect on the partial embryo development time kinetic parameters, but BMI has a little effect on it.
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